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# 100 mL of a colloidal solution is completely precipitated by addition of 5 mL of 1 M Nacl solution . Calculate the coagulation value of Nacl .

$(a)\;50\qquad(b)\;5\qquad(c)\;15\qquad(d)\;0.050$

Explanation :
Cogulation value is the millimoles of an electrolyte that must be added to 1 L of a colloidal solution for complete coagulation .
Therefore , 5 mL of 1 M Nacl = $\large\frac{1}{1000}\times 5 = 0.005$ or 5 m moles .
100 mL of a colloidal solution require Nacl for complete coagulation = 50 m moles
Therefore , Coagulation value of Nacl = 50